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"Lenny Norbeck and his friends The Mikes set out to investigate the suspicious death of a young pitcher at a Phillies game"--Provided by publisher.

The Aldens are thrilled to be helping out at Cogwheel Stadium as the Clayton Cogs try to win the pennant, but when the children realize someone has stolen the team's pitching signals and given them to the other team, they set out to find the spy before he ruins the team's chance at victory.

The Aldens discover that one of Pikesville's little league coaches has been cheating all season, which is somehow related to a plan to raze the town's historic baseball field.

Through the window of their hotel room in the Toronto Blue Jays baseball stadium, cousins Mike and Kate spot strange blue lights flashing across the bullpen and decide to investigate.

"When Mike and Kate visit Detroit, someone is blackmailing the Tigers' famous slugger, Tony Maloney"--Provided by publisher.

When the struggling Mason High Lions baseball team suddenly starts winning after many disappointing seasons, Avery and his friend Katie investigate whether someone is cheating.

While visiting Houston, Texas, Mike and Kate tour the Johnson Space Center with an astronaut in the morning and at the Houston Astros' ball game that evening, the cousins search for the person who steals the astronaut's moonrock when he arrives at the stadium to sign autographs.